Inherent hydrostatic tensile strength of tungsten nanocrystals

Котречко, С. А.; Ovsjannikov, O.; Mazilova, T. I.; Mikhaĭlovskij, I. M.; Sadanov, E. V.; Stetsenko, Nataliya

doi:10.1080/14786435.2017.1285500

Cited by 7 publications

(8 citation statements)

References 28 publications

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“…For nanocrystal failure under multiaxial uniform (hydrostatic) tension, a protrusion was formed on the spherical part of specimen. It was created by selection of special schedules for the high-field evaporation of atoms from the nanospecimen surface [19]. This is shown schematically in Figure 2a.…”

Section: Methods Of Physical and Numerical Experiments 21 Field-indmentioning

confidence: 99%

“…Recently, two approaches exist to explain Atomic Mechanisms Governing Strength of Metallic Nanosized Crystals http://dx.doi.org/10.5772/intechopen.75159 size effect. The first of them is based on a "global" criterion of limit state [8,10,16], and the second one employs the "local" criterion of nanocrystal instability [14,15,18,19].…”

Section: The Effect Of Surfacementioning

confidence: 99%

“…This is impossible to be realised under conditions of uniform triaxial tension. To analyse the details of this mechanism of bcc!fcc transition in nanosized crystals, hydrostatic tension of a molybdenum nanoball with a diameter of 10.8 nm was simulated [19]. MD simulations were performed for T = 77 K (the temperature for which the experimental data were obtained) and also for a lower temperature of 30 K. Simulation at lower temperatures makes it possible to obtain a clearer picture of atomic rearrangements, since thermal "smearing" of atom locations is reduced.…”

Section: Nanosized Crystal Instability Under Hydrostatic Tensionmentioning

confidence: 99%

“…Nanosized crystals of bcc metals are a classical object of MD simulation [7][8][9][10][11][12][13]. Currently, considerable attention is paid to metals with a bcc lattice [14][15][16][17][18][19][20]. From a physical point of view, bcc metals are more interesting because they provide a greater variety of atomic rearrangements, governing the strength.…”

Section: Introductionmentioning

confidence: 99%

“…In this connection, the appearance of direct experimental data on the strength of bcc nanocrystals substantially facilitated the problem of selection and verification of these potentials. A great number of works on MD-simulation enabled to predict the key effects controlling the level of strength of nanosized nanocrystals, namely: (i) the size effect, (ii) dependence of strength on orientation, (iii) the temperature dependence of strength, and (iv) dependence of strength on the stress state mode [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. At the same time, the absence of a completed theory of strength of nanosized crystals is a characteristic feature of science of the strength of these objects.…”

Section: Introductionmentioning

confidence: 99%

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Atomic Mechanisms Governing Strength of Metallic Nanosized Crystals

Котречко¹,

Ovsijannikov²,

Mikhaĭlovskij³

et al. 2018

Molecular Dynamics

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Fundamentals of the atomic mechanisms governing the strength of nanosized metallic crystals are described. An attempt is made to explain on this basis the size and orientation effects, temperature dependence of strength and atomism of fracture of bcc crystals under triaxial uniform (hydrostatic) tension. A feature of the proposed material is that it combines the results of molecular dynamics simulation with the data of experimental research findings on failure of metallic nanosized crystals under the high-field mechanical loading. It is exhibited that local instability of the lattice is the main mechanism governing the strength of defect-free nanosized crystals (NSC). Based on the concept of local instability, an explanation is given of the nature of the size effect in NSC, as well as of the differences in its manifestation in nanocrystals with bcc and fcc lattices. The concept of the mechanism of thermal activation of local instability is outlined. This enables to explain the specific features of the temperature dependence of NSC. The results of experimental studies and molecular dynamics simulation of the failure of tungsten nanocrystals under hydrostatic tension are presented. The ideas about the atomism of the bcc-fcc transition in these conditions are articulated.

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Section: Methods Of Physical and Numerical Experiments 21 Field-indmentioning

confidence: 99%